Ask yourself this... Boeing 737s, Airbus A320s, A330s etc all perform air turn backs several times a day, many experience significant faults (engine shut downs, electrical issues, smoke or fumes on board) on a regular basis, but does it stop you flying on one? The fact that the new aircraft of the day is reported on in the press is what makes threads like this. No-one will remember the problems in 10 years.
I'd say that a main battery fire is a major problem, much worse than any of the above.